track.label is never set when audio is captured in the UI process.
<rdar://problem/35315438>
Created attachment 325716 [details] Proposed patch.
Comment on attachment 325716 [details] Proposed patch. Clearing flags on attachment: 325716 Committed r224338: <https://trac.webkit.org/changeset/224338>
All reviewed patches have been landed. Closing bug.